Method for generating a non-graphical digital image from an original digital image

Abstract

A method for generating a non-graphical digital image from an original digital image includes the following steps: performing edge detection to generate a third digital image, performing screen dot detection to detect the photo regions in the original digital image, detecting color regions in the original digital image, removing the photo regions and the color regions from the third digital image to generate the non-graphical digital image.

1. A method for generating a non-graphical digital image from an original digital image, comprising:
 detecting first areas of the original digital image whose luminance values are above a first predetermined luminance threshold; 
 detecting second areas of the original digital image whose luminance values are below a second predetermined luminance threshold, the second predetermined luminance threshold being smaller than the first predetermined luminance threshold; 
 dilating the first areas to generate a first digital image; 
 dilating the second areas to generate a second digital image; 
 generating a third digital image including edges from dilated first and second areas; 
 performing screen dot detection in the original digital image for detecting photo regions; 
 detecting color regions in the original digital image; and 
 removing the photo regions and the color regions from the third digital image to generate the non-graphical digital image. 
 
     
     
       2. The method of  claim 1  wherein detecting the color regions in the original digital image comprises detecting the color regions in the original digital image through chrominance of pixels. 
     
     
       3. The method of  claim 1  wherein generating the third digital image including the edges from the dilated first and second areas comprises intersecting the dilated first and second areas to generate the edges.